Do you need priority boarding for a 45L backpack on Ryanair?

In most cases, yes. A 45L backpack exceeds Ryanair's free personal item limit of 40 × 20 × 25 cm and requires priority boarding to bring on board as a carry-on. Without priority, the bag may be gate-checked or you may be charged a fee.

Can a 45L backpack be a personal item on Ryanair?

Unlikely. Ryanair's free personal item must fit within 40 × 20 × 25 cm. A 45L backpack typically exceeds these dimensions, especially in depth. It should be treated as a carry-on, which requires paid priority boarding.

Ryanair Carry-On Rules — What Actually Fits (and What You'll Pay For)

Will a 45L Backpack Fit on Ryanair?

Q: Will a 45L backpack fit on Ryanair?

Yes. A 45L backpack fits within Ryanair's carry-on limit of 55 × 40 × 20 cm. However, carry-on access requires paid priority boarding. Without it, only a small personal item (40 × 20 × 25 cm) is included free.

A 45L backpack fits within Ryanair's carry-on dimensions (55 × 40 × 20 cm) — but carry-on access requires paid priority boarding.

Without priority boarding, only a small personal item (40 × 20 × 25 cm) is included free. A 45L bag will almost certainly exceed that limit.

Placement: Carry-On (Priority Required) Confidence: High

Last updated: March 2026

A 45L backpack fits within Ryanair's carry-on limit of 55 × 40 × 20 cm, though taller or wider builds at this size should be checked carefully. However, Ryanair only includes a small personal item (40 × 20 × 25 cm) for free on standard fares. To bring a 45L bag on board, you need to purchase priority boarding — which also gives you overhead bin access. Without it, your bag may be gate-checked and charged. Pre-purchasing priority online is significantly cheaper than paying at the gate.

Check if this will actually fit your trip →

Will This Bag Actually Work for Your Trip?

Your result depends on what you pack, not just the bag size.

Trip Setup

Trip Length

Climate

Packing Profile

Laundry Access

Gear & Footwear

Gear

Laptop Bulky Layer

Extra Packed Shoes

Bag & Airline

Bag Type

Bag Size

What do these sizes mean?

Under 25L — Small personal item / daypack
30–35L — Light travel, short trips
35–45L — Standard carry-on range
45L+ — Large carry-on or checked territory

Airline

Add personal item (up to ~25L)

Use this if you plan to bring a second under-seat item like a daypack, tote, or laptop bag.

Traveler

Clothing Size

Based on real clothing volumes and packing behavior

Packing Reality Check

When Does a 45L Bag Work Well on Ryanair?

Works Well

Shorter trips (1–5 days) with light or standard packing
Warm or mild climate
Priority boarding purchased
Carry-on-compliant bag design (55 × 40 × 20 cm)
Minimal extras — no heavy gear

Watch For

7-day trips with heavy packing — volume exceeds usable capacity
Cold weather gear adding bulk
Laptop + extra shoes + heavy wardrobe
Approaches Ryanair's 10 kg weight limit
No priority boarding — bag cannot board without it

Ryanair Bag Policy

Ryanair Carry-On Rules

Personal item (free)	40 × 20 × 25 cm — must fit under the seat
Carry-on (priority only)	55 × 40 × 20 cm (21.7 × 15.7 × 7.9 in) — requires paid priority boarding
Weight limit	10 kg for carry-on; no stated weight limit for personal item
Enforcement	Strict — bags are measured at the gate; oversized items may be charged
Fit at 45L	A 45L backpack fits as a carry-on with priority boarding — too large for the free personal item slot

A 45L backpack fits comfortably within Ryanair's carry-on limit of 55 × 40 × 20 cm. However, carry-on access is not included by default — you must purchase priority boarding (available online or at the gate, but cheaper online). Without priority, only a small personal item (40 × 20 × 25 cm) is allowed free. A 45L bag will not fit the personal item sizing frame. Ryanair enforces these limits consistently at the gate.

Gear

Example Bags for This Setup

Example bags that match this setup based on real packing capacity and airline limits.

Bottom Line

A 45L bag fits within Ryanair's carry-on limit — but requires paid priority boarding
Without priority, only a small personal item (40 × 20 × 25 cm) flies free
Pre-purchase priority online — it is significantly cheaper than paying at the gate
Ryanair enforces bag limits strictly and consistently at boarding
Use the calculator above to check your specific trip setup

Other bag sizes on Ryanair

Will a 30L backpack fit on Ryanair? →

Will a 35L backpack fit on Ryanair? →

Will a 40L backpack fit on Ryanair? →

Same size on other airlines

Will a 45L backpack fit on Delta? →

Will a 45L backpack fit on United? →

Will a 45L backpack fit on American? →

Will a 45L backpack fit on Southwest? →

Will a 45L backpack fit on EasyJet? →

Packing guides

What to pack for a 3-day trip →

What to pack for a 5-day trip →

What to pack for a 7-day trip →

What to pack for a 10-day trip →

Not sure if it'll all fit? Try the packing calculator →

Notes

How Accurate Is This?

This tool reflects real-world packing conditions, not just theoretical bag sizes. Results are based on typical clothing volumes, packing efficiency, and common travel setups.

Ryanair's carry-on limit is 55 × 40 × 20 cm, but carry-on access requires paid priority boarding. Without it, only a small personal item is free. A 45L bag should be treated as a carry-on on Ryanair. Final acceptance at the gate depends on packed external dimensions — not the bag's listed volume.

This is a planning tool, not a guarantee. Airline staff make the final call — packed shape, bag rigidity, and gate-day enforcement all play a role.